package org.lanqiao.tjut.myUtils;
import java.awt.Color;    
import java.awt.Font;    
import java.awt.Graphics;    
import java.awt.image.BufferedImage;    
import java.util.HashMap;    
import java.util.Map;    
import java.util.Random;    
    
/**    
 * @Title: GraphicsUtil.java  
 * @copyright   
 * @Package com.utils  
 * @Description: TODO(生成验证码)  
 * @author Mr.chen  
 * @date 2016-11-2 下午03:31:30  
 */    
public class GraphicsUtil {    
        
    private Font mFont = new Font("Times New Roman", Font.PLAIN, 17);     
        
    Color getRandColor(int fc,int bc){    
        Random random = new Random();         
        if(fc>255) fc=255;         
        if(bc>255) bc=255;         
        int r=fc+random.nextInt(bc-fc);         
        int g=fc+random.nextInt(bc-fc);         
        int b=fc+random.nextInt(bc-fc);         
        return new Color(r,g,b);    
    }    
         
    public Map<String, Object> getGraphics(){    
             
        int width=100,height=18;    
        BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);    
        Graphics g=image.getGraphics();    
        Random random = new Random();         
        g.setColor(getRandColor(200,250));         
        g.fillRect(1, 1, width-1, height-1);         
        g.setColor(new Color(102,102,102));         
        g.drawRect(0, 0, width-1, height-1);         
        g.setFont(mFont);         
        g.setColor(getRandColor(160,200));         
        //画随机线         
        for (int i=0;i<155;i++){         
            int x = random.nextInt(width - 1);         
            int y = random.nextInt(height - 1);         
            int xl = random.nextInt(6) + 1;         
            int yl = random.nextInt(12) + 1;         
            g.drawLine(x,y,x + xl,y + yl);         
        }         
            
        //从另一方向画随机线         
        for (int i = 0;i < 70;i++){         
            int x = random.nextInt(width - 1);         
            int y = random.nextInt(height - 1);         
            int xl = random.nextInt(12) + 1;         
            int yl = random.nextInt(6) + 1;         
            g.drawLine(x,y,x - xl,y - yl);         
        }         
            
        //生成随机数,并将随机数字转换为字母         
        String sRand="";         
        for (int i=0;i<6;i++){         
            int itmp = random.nextInt(26) + 65;         
            char ctmp = (char)itmp;         
            sRand += String.valueOf(ctmp);         
            g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));         
            g.drawString(String.valueOf(ctmp),15*i+10,16);         
        }         
            
        g.dispose();    
                
        Map<String, Object> map=new HashMap<String, Object>();    
        map.put("rand", sRand);    
        map.put("image", image);    
        return map;    
     }    
    
}  
